Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2021, Vol. 37 ›› Issue (12): 112-120.doi: 10.11924/j.issn.1000-6850.casb2020-0287

Special Issue: 水产渔业

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Effect of Chlorella on the Quality and Bacterial Community Structure of GIFT Tilapia Culture Water

Qin Lu1(), Chen Xi2, Qiu Liping2, Fan Limin2, Song Chao2, Zheng Yao2, Meng Shunlong1,2, Chen Jiazhang1,2()   

  1. 1 Wuxi Fisheries College, Nanjing Agricultural University, Wuxi Jiangsu 214081
    2Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences/Scientific Observing and Experimental Station of Fishery Resources and Environment in the Lower Reaches of the Yangtze River, Ministry of Agriculture/Key Open Laboratory of Ecological Environment and Resources of Inland Fisheries, Wuxi Jiangsu 214081
  • Received:2020-07-24 Revised:2020-10-21 Online:2021-04-25 Published:2021-05-13
  • Contact: Chen Jiazhang E-mail:1332514079@qq.com;chenjz@ffrc.cn

Abstract:

By adding Chlorella to tilapia aquaculture water, this study aims to explore the optimal concentration of Chlorella for the degradation of N and P and the regulation of microbial community in aquaculture water. Control group (NC), low concentration group (LC), middle concentration group (MC) and high concentration group (HC) were set to explore the effects of different concentrations of Chlorella on reducing the concentration of N and P in tilapia aquaculture water. The 16S rRNA high-throughput sequencing technology was used to analyze bacteria community structure changes of aquaculture water body. Compared with other treatment groups, N and P nutrition of water body in HC group decreased, and the degradation rate of nitrogen in three forms was NH4 +-N>NO3--N>NO2--N. Compared with NC group, the microbial diversity of MC and HC group decreased. The relative abundance of Proteobacteria in each treatment group increased, while that of Bacteroidetes decreased, and the relative abundance of Bacteroidetes in HC group was the highest, the community richness was significantly correlated with the content of NH4+-N. In summary, Chlorella can absorb N and P nutrition from aquaculture water, regulate aquaculture water microbial community structure, and improve aquaculture water quality. The study could provide a theoretical basis for aquaculture production practice.

Key words: Chlorella, tilapia, aquaculture water, water quality, the degradation of N and P, high-throughput sequencing, bacterial community structure

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